Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well
- (Bothell, WA)
Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information useful to determine the resistivity of adjacent geological formations from within the cased well are described. The multiple electrode apparatus has a plurality of spaced apart voltage measurement electrodes that electrically engage a portion of the interior of the cased well. During measurements of information useful to determine formation resistivity, current is conducted between a first current conducting electrode in electrical contact with the interior of the cased well to a second current conducting electrode that is also in electrical contact with the interior of the cased well. The first and second current conducting electrodes are separated by a distance sufficient so that at least a portion of the current conducted between the first and second current conducting electrodes is conducted through the geological formation of interest.
- Research Organization:
- ParaMagnetic Logging, Inc. (Bothell, WA)
- DOE Contract Number:
- FG06-84ER13294
- Assignee:
- Western Atlas International, Inc. (Houston, TX)
- Patent Number(s):
- US 6246240
- OSTI ID:
- 873784
- Country of Publication:
- United States
- Language:
- English
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